Hollywood panders to the 18-to-34 crowd. That demographic doesn't care about race and the package it comes in. They care about the hottest chick. They just like hot chicks. ↗
Famous people feel that they must perpetually be on the crest of the wave, not realising that it is against all the rules of life. You can't be on top all the time, it isn't natural. ↗
Playing good girls in the 30s was difficult, when the fad was to play bad girls. Actually I think playing bad girls is a bore; I have always had more luck with good girl roles because they require more from an actress. ↗